Tread portion of an automobile tire



FIG. 1 is a front view of a tread portion of an automobile tire;

FIG. 2 is a perspective view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is an enlarged, fragmentary front view thereof, showing the details of the tread portion shown between lines 6-6 and 6′-6′ of FIG. 1; and,

FIG. 7 is a cross-section view, taken along line 7-7 of FIG. 6.

Broken lines in the drawing figures are intended to show environmental structure only, and form no part of the claimed design. 

The ornamental design for a tread portion of an automobile tire, as shown and described. 